Anti-Cheat is in a lot of games now and doesn't really do much to prevent cheaters. More often than not, it just makes it more annoying to play the game as a casual player. So, if you are getting the “Anti-Cheat Not Installed” error message in Delta Force before the game window opens. This article will take you through a few simple steps you can use to solve this problem. If you are having issues like this with other games, you can use most of the same basic steps as well, they are quite universal.

Takeaways:

  1. Delta Force ACE anti-cheat constantly causes the game to crash at launch.
  2. Why doesn't Anti-Cheat (ACE) install automatically when Delta Force installs vis Steam?

How to Fix Delta Force Anti-Cheat Not Installed on PC

Even if Steam has finished downloading and installing the game, it may not have fully installed Anti-Cheat. This isn't super common, but it does happen.

  • Close Delta Force and Steam, then restart Windows.
  • Open Steam > Library, right-click Delta Force, and select Properties.
  • Open Installed Files and select Verify integrity of game files.
  • Wait for verification to finish, then launch Delta Force.

Fix Delta Force Anti-Cheat Not Installed on PC

Run the Bundled ACE Installer

Manually install ACE using the installer inside the games folder.

  • In Steam, right-click Delta Force and select Manage > Browse local files.
  • Open Game\DeltaForce\Binaries\Win64\AntiCheatExpert.
  • Right-click ACE-Setup64.exe and select Run as administrator.
  • If the installer offers only Uninstall, confirm it while Delta Force is closed.
  • Restart Windows and launch Delta Force so the official ACE package can be installed again.

Rebuild the ACE Folder if the Installer Fails

If ACE-Setup64.exe is missing or doesn't work, you can rebuild the folder instead. It's pretty quick so worth an attempt.

  • Close Steam completely.
  • Rename the AntiCheatExpert folder to AntiCheatExpert.old.
  • Reopen Steam and verify the Delta Force game files.
  • Allow Steam to download a fresh ACE folder.
  • Launch the game again.

Renaming the folder preserves a backup while removing the damaged copy from the active installation.

Close Software That Might Conflict With ACE

It's possible that there is another bit of software installed on your computer that is causing issues with ACE.

  • Close debuggers, automation scripts, virtual machines, remote-control software, frame-capture tools, and hardware macro programs.
  • For a clean test, also close monitoring and overlay utilities such as MSI Afterburner and RivaTuner Statistics Server.
  • In Steam, open Delta Force > Properties > General and temporarily disable Enable the Steam Overlay while in-game.
  • Launch Delta Force again.
  • If it works, reopen optional programs one at a time to identify the conflicting application.

Reinstall Delta Force

If nothing listed above has helped, you might as well go ahead and uninstall and reinstall Delta Force on your computer. Just make sure to restart your system in between the uninstall and reinstall.

  • Uninstall Delta Force through Steam.
  • Restart Windows.
  • Reinstall the game to a normal local Steam library.
  • Launch it with overlays and potentially conflicting software closed.
  • Allow the official ACE installer to complete any administrator prompts.
  • If the error returns, record the exact message, Windows version, and Steam version.
  • Note whether ACE-Setup64.exe ran successfully, whether an ACE service exists, and whether Windows Security quarantined an ACE file.